EP1870375A2 - Loading machine - Google Patents
Loading machine Download PDFInfo
- Publication number
- EP1870375A2 EP1870375A2 EP07011815A EP07011815A EP1870375A2 EP 1870375 A2 EP1870375 A2 EP 1870375A2 EP 07011815 A EP07011815 A EP 07011815A EP 07011815 A EP07011815 A EP 07011815A EP 1870375 A2 EP1870375 A2 EP 1870375A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- wheel
- loading
- loading arm
- machine
- braking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/24—Safety devices, e.g. for preventing overload
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
- B60T13/26—Compressed-air systems
- B60T13/38—Brakes applied by springs or weights and released by compressed air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/1701—Braking or traction control means specially adapted for particular types of vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
- B60T8/1769—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS specially adapted for vehicles having more than one driven axle, e.g. four-wheel drive vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/44—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
- B60T8/447—Reducing the boost of the power-assist booster means to reduce brake pressure
- B60T8/448—Reducing the boost of the power-assist booster means to reduce brake pressure the power-assist booster means being a vacuum or compressed air booster
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/46—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition the pressure being reduced by exhausting fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/065—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted
- B66F9/0655—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks non-masted with a telescopic boom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/07554—Counterweights
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
- E02F9/2207—Arrangements for controlling the attitude of actuators, e.g. speed, floating function for reducing or compensating oscillations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
Definitions
- This invention relates to a loading machine for performing loading operations and more particularly to a loading machine having a loading arm mounted at a position towards a rear of the machine and which extends forwardly.
- Such machines conventionally may only be driven over the ground at relatively slow speeds, for example around 30 km per hour. Whereas this speed is adequate when such a machine is performing loading operations, it is overly slow for road travel, for example for moving the machine from one location to another. Accordingly it is usual to transport such machines on a loader vehicle between work locations.
- a loading machine in accordance with the invention may by virtue of the suspension and four wheel anti-locking brakes, safely travel at high speeds over the ground reducing the requirement for transporting the machine between work locations.
- the suspension suspending each of the front and rear axles desirably is a non-reactive in that the vertical load on the respective wheels carried by the axle, and hence the traction between the wheels and the ground, does not significantly vary in response to changes in the driving torque applied to the wheels through the transmission.
- the suspension includes for at least one of the front and rear axles at each side of the machine, a pair of links, one link of each pair being above the other relative to the ground, the links each pair being pivotally connected at their one ends to relative to the body and at their other ends to the respective axle.
- the suspension includes for the at least one axle, damping struts to damp axle movements, the struts being provided between the axle and the body.
- Each braking device is preferably operated by hydraulic fluid pressure.
- the braking devices for applying braking to each of the wheels may be operated to apply the brake by hydraulic fluid pressurised by an air-hydraulic actuator.
- the machine may include an air system which includes the air-hydraulic actuator.
- the brake control system includes for each wheel, a wheel speed sensor, the brake control system also including a controller responsive to wheel speed signals from each of the wheel speed sensors, and operative to determine whether any braked wheel is skidding relative to the ground as a result of becoming locked during braking, and in the event that a skidding condition is determined, the controller modulating the hydraulic fluid pressure provided to apply braking to at least the skidding wheel.
- the controller may modulate the hydraulic pressure provided to apply braking by cycling the pressure between a pressure reduction phase and a pressure increase phase, although a cycle may also include a pressure hold phase between the pressure reduction and the pressure increase phases.
- controller may modulate the hydraulic fluid pressure provided to apply braking to the at least one skidding wheel only, preferably the controller modulates the hydraulic fluid pressure provided to apply braking to both wheels of the front and/or the rear axle where any or both wheels are determined to be skidding relative to the ground during braking as a result of becoming locked.
- the hydraulic fluid pressure is modulated by modulating air pressure supplied to the air-hydraulic actuator.
- the body includes, at the rear end, a counterweight at a low position, which counterweight extends rearwardly of the body beyond the horizontal axis about which the loading arm is moveable.
- the loading arm may be mounted at a relatively high position.
- the horizontal axis about which the loading arm is moveable may be located in a generally horizontal plane which contains or is spaced above or at least close to an upper level of the operator's cab. However, a lower mounting position may be provided if required.
- the engine could be mounted by the body at a side of the body opposite to the position of the cab, preferably the engine is mounted by the body above the rear axle and below a rear portion of the loading arm, so as to provide some counterweighting during loading operations, and to minimise the body width.
- the loading implement When a loading implement is mounted at the outermost end of the loading arm, the loading implement may be a loading device such as a pair of forks, provided on a carriage which is mounted to the loading arm mounting.
- the carriage may include at least one wheel, which when the loading arm is in a lowered position, engages the ground.
- the provision of the at least one wheel on the carriage may enable the counterweight to be reduced, enabling the machine to be made lighter than otherwise, thereby enabling the machine to travel faster than a comparable machine without this carriage wheel feature.
- a loading machine 10 which includes a body 11 including a housing 12 for an engine which provides power for the machine 10. The position of the engine is indicated at 13.
- the machine 10 further includes a ground engaging structure including a front pair of wheels 15 and a rear pair of wheels 16, the front pair of wheels 15 being carried on a front axle 18 and the rear pair of wheels 16 being carried on a rear axle 19.
- Both pairs of wheels 15, 16 in this example are driven wheels, being driven by their respective axles 18, 19 from respective transmission members (not seen) of a mechanical machine transmission T to which drive is provided from the engine 13. All four wheels 15, 16 are braked by a braking system 5 which is shown schematically in figure 2.
- the body 11 of the loading machine 10 mounts the engine 13 at or towards a rear end thereof.
- the body 11 also includes at or towards the rear end thereof, a tower mounting structure 22 which includes a pair of plates between which is mounted a telescopic or otherwise extendible loading arm 25.
- the loading arm 25 is mounted by mounting structure 22 of the body 11, at an inboard end, for pivotal up and down movement about a first generally horizontal axis A, under the control of one or more hydraulically powered lifting actuators 30.
- the loading arm 25 extends forwardly from its mounting 22, beyond a front end of the body 11 to an outermost end, where the loading arm 25 has a mounting 34 for a loading implement 32, which in this example is a loading device i.e. a pair of forks 35, carried on a carriage 28.
- a loading implement 32 which in this example is a loading device i.e. a pair of forks 35, carried on a carriage 28.
- the loading implement 32 is pivotal relative to the loading arm 25 about a second generally horizontal axis B, by a hydraulically operated actuator (not shown).
- the first horizontal axis A about which the loading arm 25 is moveable is in this example, provided at a relatively high position, in a generally horizontal plane P which contains or is spaced above or at least close to an upper level of an operator's cab 9 where controls for operating the loading arm 25, and for driving the machine 10 over the ground, are located.
- the body 11 includes, at the rear end, a counterweight 33 at a low position, which counterweight 33 extends rearwardly of the body 11 beyond the horizontal axis A about which the loading arm 25 is moveable.
- the engine 13 could in another example, be mounted by the body 11 at a side of the body 11 opposite to the position of the cab 9
- the engine 13 is mounted by the body 11 above the rear axle 19 and below a rear portion of the loading arm 25 where the arm 25 is mounted to the tower mounting structure 22, so as to provide some additional counterweighting during loading operations, and to minimise the body width.
- the operator's cab 9 is mounted at a side of the body 11 opposite to the loading arm 25 so that the loading arm 25 extends to the side of the cab 9.
- the carriage 28 of the loading device 35 includes at least one wheel 27, but in this example a pair of wheels 27, which when the loading arm 25 is in a lowered position as shown in figure 1, engages the ground.
- the provision of the at least one wheel 27 on the carriage 28 enables the counterweight 33 to be reduced, enabling the machine 10 to be made lighter than otherwise, thereby enabling the machine 10 to travel faster than a comparable machine without this wheel 27 feature.
- the loading arm 25 is extendible by the operation of a telescoping hydraulic actuator 12 which in this example is mounted exteriorly of the loading arm 25 along a top thereof but in another example may be mounted internally of the loading arm 25 as required.
- the loading arm 25 in the example is a two or three stage telescoping arm 25.
- the machine 10 is intended for relatively low level loading work as described below. In another example a three or more stage loading arm 25 could instead be provided where greater height reach is required.
- the loading machine 10 is intended for relatively low level loading at a work location.
- the machine 10 may handle standard size shipping containers to load and unload them onto the backs of lorries for example.
- the load is not intended to be lifted to great heights e.g. by fully extending the loading arm 25, but this extension is required to enable loads to be withdrawn from and placed inside containers for examples.
- the carriage 28 With a ground engaging wheel 27, the load carried by the lifting forks 35 may be supported on the ground at least when the arm 25 is at maximum reach, whilst the arm 25 is retracted to a length at which the counterweight 33 (and engine 13 weight) can counterbalance the load while it is lifted.
- self-levelling of the loading implement 32 may be achieved by other means.
- the loading machine 10 is capable of high speed travel, for example well in excess of 30 km per hour.
- the rear axle 19 is pivotally connected to a pair of links 100, 101, one of which i.e. the link indicated at 100, being above the other 101 relative to the ground, the links 100, 101 of each pair being pivotally connected at their one ends 100a; 101 a relative to the body 11 and at their other ends 100b; 101 b to the rear axle 19.
- Damping struts 105 are provided to damp axle 19 movements, between the axle 19 and the body 11, the struts in this example being hydraulic devices (e.g. pistons within cylinders), with gas springs 106, but other damping strut arrangements are possible.
- the links 100, 101 are leading links, i.e. they extend forwardly from the rear axle 19, but in another construction may be trailing links.
- the front axle 18 is suspended from the body 11 by a non-reactive suspension substantially similar to that shown in figure 1a although the pivoted links 100, 101 at each side of the body 11, are preferably trailing links.
- each of the front and rear axles 18, 19 is suspended from the body 11 by a non-reactive suspension as described, other suspension arrangements are possible.
- Pressurised hydraulic fluid for powering the various hydraulic actuators 30 of the loading arm 25 and loading device 32 is provided by a hydraulic pump 36 (see figure 2) driven directly from the engine 13, the pump 36 pumping fluid from a reservoir 37 to a hydraulic system, fluid flow to the various actuators 30 being controlled by one or more hydraulic control valves 40 which may be manually or electrically operated as required.
- a supply of pressurised hydraulic fluid is always available while the engine 13 is running.
- the loading machine 10 further includes an air compressor 45 which may be driven from for example, an engine turbocharger, or otherwise from the engine 13 or from a motor.
- the air compressor 45 pressurises air in a pressurised air system 46, and particularly charges a reservoir 48, the pressurised air being usable as hereinafter described, by the braking system 5 for applying service brakes of the machine 10.
- the pressurised air is delivered to an air valve 49 which is actuated by a brake pedal 50 which is located in the operator's cab 9.
- the proportion of air which is permitted to pass the valve 49 depends upon the extent to which the foot pedal 50 is depressed and thus the air pressure downstream of the valve 49 is representative of a brake demand.
- the ground engaging structure provides for each wheel 15, 16 in this example, a braking device 56 for applying braking to the wheel 15, 16, each braking device 56 being operated to apply the brake by hydraulic fluid pressurised by an air-hydraulic actuator 55.
- Each air-hydraulic actuator 55 may be operative to supply pressurised hydraulic fluid to one or a plurality of the braking devices 56.
- each braking device 56 is a pad and disc type device including a rotatable member namely a disc 57, which rotates with the associated wheel 15, 16, and a braking member, i.e. a pad 58 (or pads) which is/are moveable into frictional engagement with the rotating disc 57 to effect braking, by hydraulic fluid acting for example through a "slave" piston and cylinder arrangement.
- the air-hydraulic actuator 55 pressurises hydraulic fluid from a brake fluid reservoir 62, by means of an air powered servo 61 mechanism such that the hydraulic fluid pressure developed, and accordingly the extent of braking, depends upon the air pressure delivered from the pedal operated air valve 49.
- the brake pedal 50 the greater the braking force applied by the braking device 56 to its associated wheel 15, 16, to match the brake demand.
- the service brakes 56 preferably are released by mechanical springs when air pressure is no longer supplied to the air-hydraulic actuators 55, i.e. when the brake pedal 50 is released.
- the foot pedal 50 too may be returned to its uppermost, unbraking position, by a mechanical spring, although in each case some other brake return/pedal release mechanism may be provided as required.
- the braking system 5 for the machine 10 further includes a brake control system including a controller 110 which provides a brake anti-locking function to resist any braked wheel 15, 16 skidding relative to the ground as a result of becoming locked during braking when a low friction condition exists between the wheel 15, 16 and the ground.
- a brake control system including a controller 110 which provides a brake anti-locking function to resist any braked wheel 15, 16 skidding relative to the ground as a result of becoming locked during braking when a low friction condition exists between the wheel 15, 16 and the ground.
- the braking system 5 includes, for each braking device 56, a wheel speed sensor 112 to sense the rotational speed of each of the wheels 15, 16 and to provide an electrical signal input to the controller 110 along a line, one of which for the one wheel shown in figure 2, is indicated at 114.
- the wheel speed sensor 112 typically includes an annulus of teeth which rotate with the wheel 15, 16 e.g. with the rotatable brake disc 57, and an optical sensing device mounted with respect to a wheel hub, for sensing the teeth as they move past the device as the wheel, and hence as the annulus, rotates.
- the construction of such a wheel speed sensor 112 is well known and further description is considered unnecessary.
- the controller 110 is configured to determine from the electrical signal inputs from the wheel speed sensors 112 of all or at least some of the wheels 15, 16, when the brakes are applied, whether any wheel is skidding, or is about to skid, relative to the ground as a result of becoming locked during braking when a low friction condition exists between the ground and the wheel.
- controller 110 may be achieved by the controller 110 using an algorithm which compares wheel 15, 16 speeds as sensed, and makes calculations as is well known in the art of anti-lock braking technology.
- the controller 110 is operative to modulate the hydraulic fluid pressure provided by the air-hydraulic actuator 55 which provides hydraulic fluid pressure to apply braking, to at least the skidding wheel 15, 16.
- modulated hydraulic fluid pressure is supplied at least to both the wheels 15 or 16 on the axle 18, 19 on which a skidding or potentially skidding wheel is sensed, and more preferably, to all four wheels 15, 16 in the event that any one wheel 15, 16 is determined to be skidding or about to skid.
- the controller 110 may modulate the hydraulic pressure provided to apply braking by cycling the hydraulic fluid pressure provided by the air - hydraulic actuator 55 or actuators, between a pressure reduction phase and a pressure increase phase although a cycle may also include a pressure hold phase between the pressure reduction and the pressure increase phases. In each case, by cycling releasing and applying the braking force applied to a wheel, steerability of the machine 10, even at high speeds may be maintained during braking without risk of loss of control.
- Such modulation of the hydraulic fluid pressure is preferably achieved by modulating the brake demand pressurised air signal which is delivered from the foot pedal 50 valve 49.
- the braking system 5 may include a single one, or possibly a plurality of modulating air pressure valves 115, which in accordance with an electrical control signal which passes along a line 116 from the controller 110 to the modulating air pressure valve 115, modulates the demand signal from the foot brake 50 valve 49, which is applied to the air-hydraulic actuator or actuators 55.
- each air pressure modulating valve 115 serving only one or two of the air-hydraulic actuators 55 for one or two of the braking devices 56 for one or two of the wheels 15, 16, this would permit the controller 110 to modulate the brake demand signal differently for e.g. for the front and the rear wheels 15, 16, if required.
- the brake demand signal is only modulated to modulate the hydraulic fluid pressure applied to the braking device 56 or devices, when a skidding condition or potential skidding condition, is determined.
- the machine 10 further includes a transmission brake for applying primarily when the machine 10 is parked, and particularly when no supply of pressurised air for the service brakes 56, may be available.
- the machine 10 is four wheel driven and accordingly to achieve adequate transmission braking, two such transmission brakes, indicated at 65, 66 are provided.
- Each transmission brake 65, 66 in this example includes a disc 67 each of which is carried by a respective transmission member for the rear wheel 16 drive, and for the front wheel 15 drive. Also there is provided for frictionally engaging each disc 67, a pad, or pads 68 in this example. The pads 68 are urged towards and into engagement with their respective discs 67, by mechanical springs 69, and hence in their rest conditions, the transmission brakes are applied to brake the discs 67 and hence the transmission members.
- the transmission brakes 65, 66 are releasable by the application of pressurised hydraulic fluid to pressurised hydraulic fluid brake releasing devices 70, 71.
- the transmission brake releasing devices 70, 71 being hydraulically releasable, notwithstanding that the springs 69 applying the brakes will be very strong springs in order to generate sufficient braking force to apply the transmission members 22, 23 adequately, the brake releasing devices 70, 71 may be made much smaller than comparable air operated units.
- the pressurised hydraulic fluid for releasing the transmission brakes 65, 66 is derived from the hydraulic circuit of the machine 10, via a fluid feed line indicated at 72, the hydraulic fluid passing though a transmission brake control valve 75.
- the transmission brake control valve 75 is biased by a spring 76 towards a first operative condition as indicated in figure 2, in which the hydraulically operated brake releasing devices 70, 71 are each connected through the transmission brake control valve 75 to the reservoir 37 or another low pressure area, and so the devices 70, 71 will not act to release the transmission brakes 65, 66 which thus will be applied by the springs 69.
- pressurised hydraulic fluid from the supply line 72 may pass to the hydraulically operated brake releasing devices 70, 71 to release the brakes. 65,66.
- the transmission brake control valve 75 is moved to its second operative condition when the transmission brakes 65, 66 are released only when pressurised air is provided to the valve 75 along an air supply line indicated at 78, in response to operation of an operator transmission brake control valve 80 from within the cab 9.
- the transmission brake control valve 80 is hand operated by an operator actuating a brake release lever 81.
- pressurised air for releasing the transmission brakes 65, 66 is derived from the air system 46 provided for applying the service brakes 56.
- pressurised air may be delivered from the air system 46 along a line 82 to the transmission brake control valve 80.
- the transmission brakes 65, 66 need not be of the disc and pad type, but the invention may be applied to another kind of friction brake, such as drum and calliper, where the transmission member may carry a drum, or further alternatively, the transmission brake or brakes 65, 66 may each be a multi-interleaved plate type brake.
- Pressurised air for actuating the transmission brake control valve 75 may be derived from other than the service brake air system 46, for example from a dedicated air source.
- Pressurised hydraulic fluid for releasing the transmission brake control valve 75 may be derived from other than the hydraulic system of the machine 10 which includes actuator 30 and control valve 40 for operating the loading arm 25 of the machine, for example from a dedicated pressurised hydraulic fluid supply.
- the transmission brake or brakes 65, 66 may be applied by hydraulic fluid pressure, as well as released by hydraulic fluid pressure by operation of the air actuated transmission brake control valve 75.
Abstract
Description
- This invention relates to a loading machine for performing loading operations and more particularly to a loading machine having a loading arm mounted at a position towards a rear of the machine and which extends forwardly.
- Such machines conventionally may only be driven over the ground at relatively slow speeds, for example around 30 km per hour. Whereas this speed is adequate when such a machine is performing loading operations, it is overly slow for road travel, for example for moving the machine from one location to another. Accordingly it is usual to transport such machines on a loader vehicle between work locations.
- It is increasingly becoming a requirement for such loading machines to be able to travel over the ground at greater speeds, which requires the provision of a suspension to facilitate high speed travel, and more efficient braking systems than slower machines.
- According to a first aspect of the invention we provide a wheeled loading machine according to claim 1.
- A loading machine in accordance with the invention may by virtue of the suspension and four wheel anti-locking brakes, safely travel at high speeds over the ground reducing the requirement for transporting the machine between work locations.
- The suspension suspending each of the front and rear axles, desirably is a non-reactive in that the vertical load on the respective wheels carried by the axle, and hence the traction between the wheels and the ground, does not significantly vary in response to changes in the driving torque applied to the wheels through the transmission. In one example of a non-reactive suspension, the suspension includes for at least one of the front and rear axles at each side of the machine, a pair of links, one link of each pair being above the other relative to the ground, the links each pair being pivotally connected at their one ends to relative to the body and at their other ends to the respective axle.
- Moreover, desirably, the suspension includes for the at least one axle, damping struts to damp axle movements, the struts being provided between the axle and the body.
- Each braking device is preferably operated by hydraulic fluid pressure.
- The braking devices for applying braking to each of the wheels, may be operated to apply the brake by hydraulic fluid pressurised by an air-hydraulic actuator.
- Thus the machine may include an air system which includes the air-hydraulic actuator.
- Preferably the brake control system includes for each wheel, a wheel speed sensor, the brake control system also including a controller responsive to wheel speed signals from each of the wheel speed sensors, and operative to determine whether any braked wheel is skidding relative to the ground as a result of becoming locked during braking, and in the event that a skidding condition is determined, the controller modulating the hydraulic fluid pressure provided to apply braking to at least the skidding wheel.
- For example, the controller may modulate the hydraulic pressure provided to apply braking by cycling the pressure between a pressure reduction phase and a pressure increase phase, although a cycle may also include a pressure hold phase between the pressure reduction and the pressure increase phases.
- Although the controller may modulate the hydraulic fluid pressure provided to apply braking to the at least one skidding wheel only, preferably the controller modulates the hydraulic fluid pressure provided to apply braking to both wheels of the front and/or the rear axle where any or both wheels are determined to be skidding relative to the ground during braking as a result of becoming locked.
- Preferably the hydraulic fluid pressure is modulated by modulating air pressure supplied to the air-hydraulic actuator.
Desirably, to aid stability when the machine is performing loading operations, the body includes, at the rear end, a counterweight at a low position, which counterweight extends rearwardly of the body beyond the horizontal axis about which the loading arm is moveable. The loading arm may be mounted at a relatively high position. For example, the horizontal axis about which the loading arm is moveable may be located in a generally horizontal plane which contains or is spaced above or at least close to an upper level of the operator's cab. However, a lower mounting position may be provided if required. - Whereas the engine could be mounted by the body at a side of the body opposite to the position of the cab, preferably the engine is mounted by the body above the rear axle and below a rear portion of the loading arm, so as to provide some counterweighting during loading operations, and to minimise the body width.
- When a loading implement is mounted at the outermost end of the loading arm, the loading implement may be a loading device such as a pair of forks, provided on a carriage which is mounted to the loading arm mounting. The carriage may include at least one wheel, which when the loading arm is in a lowered position, engages the ground. Particularly where the loading arm is extended to a great extent and the arm is in a lowered position, where maximum machine overturning forces are experienced, the provision of the at least one wheel on the carriage may enable the counterweight to be reduced, enabling the machine to be made lighter than otherwise, thereby enabling the machine to travel faster than a comparable machine without this carriage wheel feature.
- Embodiments of the invention will now be described with the aid of the accompanying drawings in which:-
- FIGURE 1 is a side illustrative view of a loading machine in accordance with the present invention;
- FIGURE 1 a is an illustrative side view of part of the machine of figure 1, showing a non-reactive suspension;
- FIGURE 2 is a schematic diagram of a braking system of the machine of Figure 1.
- Referring to the drawings there is shown a
loading machine 10 which includes abody 11 including ahousing 12 for an engine which provides power for themachine 10. The position of the engine is indicated at 13. Themachine 10 further includes a ground engaging structure including a front pair ofwheels 15 and a rear pair ofwheels 16, the front pair ofwheels 15 being carried on afront axle 18 and the rear pair ofwheels 16 being carried on arear axle 19. - Both pairs of
wheels respective axles engine 13. All fourwheels braking system 5 which is shown schematically in figure 2. - The
body 11 of theloading machine 10 mounts theengine 13 at or towards a rear end thereof. Thebody 11 also includes at or towards the rear end thereof, atower mounting structure 22 which includes a pair of plates between which is mounted a telescopic or otherwiseextendible loading arm 25. Theloading arm 25 is mounted bymounting structure 22 of thebody 11, at an inboard end, for pivotal up and down movement about a first generally horizontal axis A, under the control of one or more hydraulically poweredlifting actuators 30. - The
loading arm 25 extends forwardly from itsmounting 22, beyond a front end of thebody 11 to an outermost end, where theloading arm 25 has amounting 34 for aloading implement 32, which in this example is a loading device i.e. a pair offorks 35, carried on acarriage 28. - The
loading implement 32 is pivotal relative to theloading arm 25 about a second generally horizontal axis B, by a hydraulically operated actuator (not shown). - The first horizontal axis A about which the
loading arm 25 is moveable, is in this example, provided at a relatively high position, in a generally horizontal plane P which contains or is spaced above or at least close to an upper level of an operator'scab 9 where controls for operating theloading arm 25, and for driving themachine 10 over the ground, are located. - To aid stability when the
machine 10 is performing loading operations, thebody 11 includes, at the rear end, acounterweight 33 at a low position, whichcounterweight 33 extends rearwardly of thebody 11 beyond the horizontal axis A about which theloading arm 25 is moveable. Whereas theengine 13 could in another example, be mounted by thebody 11 at a side of thebody 11 opposite to the position of thecab 9, in this example theengine 13 is mounted by thebody 11 above therear axle 19 and below a rear portion of theloading arm 25 where thearm 25 is mounted to thetower mounting structure 22, so as to provide some additional counterweighting during loading operations, and to minimise the body width. The operator'scab 9 is mounted at a side of thebody 11 opposite to theloading arm 25 so that theloading arm 25 extends to the side of thecab 9. - The
carriage 28 of theloading device 35 includes at least onewheel 27, but in this example a pair ofwheels 27, which when theloading arm 25 is in a lowered position as shown in figure 1, engages the ground. Particularly where theloading arm 25 is extended to a great extent and thearm 25 is in a lowered position, wheremaximum machine 10 overturning forces are experienced, the provision of the at least onewheel 27 on thecarriage 28 enables thecounterweight 33 to be reduced, enabling themachine 10 to be made lighter than otherwise, thereby enabling themachine 10 to travel faster than a comparable machine without thiswheel 27 feature. - The
loading arm 25 is extendible by the operation of a telescopinghydraulic actuator 12 which in this example is mounted exteriorly of theloading arm 25 along a top thereof but in another example may be mounted internally of theloading arm 25 as required. Theloading arm 25 in the example is a two or threestage telescoping arm 25. Themachine 10 is intended for relatively low level loading work as described below. In another example a three or morestage loading arm 25 could instead be provided where greater height reach is required. - The
loading machine 10 is intended for relatively low level loading at a work location. For example, themachine 10 may handle standard size shipping containers to load and unload them onto the backs of lorries for example. Thus the load is not intended to be lifted to great heights e.g. by fully extending theloading arm 25, but this extension is required to enable loads to be withdrawn from and placed inside containers for examples. By providing thecarriage 28 with a groundengaging wheel 27, the load carried by thelifting forks 35 may be supported on the ground at least when thearm 25 is at maximum reach, whilst thearm 25 is retracted to a length at which the counterweight 33 (andengine 13 weight) can counterbalance the load while it is lifted. - In the example, there is provided a double acting
hydraulic actuator 31 between theloading arm 25 and thebody 11 from each side of which fluid is displaceable depending upon whether theloading arm 25 is raised or lowered, which displaced fluid is fed to the hydraulic actuator which is provided to tilt the loading implement 32 about axis B, to maintain the attitude of theloading forks 35 during lifting and lowering. - Alternatively, self-levelling of the
loading implement 32 may be achieved by other means. - The
loading machine 10 is capable of high speed travel, for example well in excess of 30 km per hour. - To enable this, and referring now particularly to figure 1 a, it can be seen that the
rear axle 19 carrying the pair ofrear wheels 16, is suspended from thebody 11 of themachine 10, in this case by a non-reactive suspension. - At each side of the
machine 10, therear axle 19 is pivotally connected to a pair oflinks links ends 100a; 101 a relative to thebody 11 and at theirother ends 100b; 101 b to therear axle 19. -
Damping struts 105, one at each side of thebody 11, are provided to dampaxle 19 movements, between theaxle 19 and thebody 11, the struts in this example being hydraulic devices (e.g. pistons within cylinders), withgas springs 106, but other damping strut arrangements are possible. - In figure 1 a it can be seen that the
links rear axle 19, but in another construction may be trailing links. - The
front axle 18 is suspended from thebody 11 by a non-reactive suspension substantially similar to that shown in figure 1a although thepivoted links body 11, are preferably trailing links. - Although it is preferred for each of the front and
rear axles body 11 by a non-reactive suspension as described, other suspension arrangements are possible. - Pressurised hydraulic fluid for powering the various
hydraulic actuators 30 of theloading arm 25 andloading device 32 is provided by a hydraulic pump 36 (see figure 2) driven directly from theengine 13, thepump 36 pumping fluid from areservoir 37 to a hydraulic system, fluid flow to thevarious actuators 30 being controlled by one or morehydraulic control valves 40 which may be manually or electrically operated as required. Thus a supply of pressurised hydraulic fluid is always available while theengine 13 is running. - The
loading machine 10 further includes anair compressor 45 which may be driven from for example, an engine turbocharger, or otherwise from theengine 13 or from a motor. Theair compressor 45 pressurises air in a pressurisedair system 46, and particularly charges areservoir 48, the pressurised air being usable as hereinafter described, by thebraking system 5 for applying service brakes of themachine 10. - The pressurised air is delivered to an
air valve 49 which is actuated by abrake pedal 50 which is located in the operator'scab 9. The proportion of air which is permitted to pass thevalve 49 depends upon the extent to which thefoot pedal 50 is depressed and thus the air pressure downstream of thevalve 49 is representative of a brake demand. The further thepedal 50 is depressed, up to its full extent of depression when substantially all the air delivered to theair valve 40 may pass therethrough to apply full braking pressure, the more pressurised air is provided to air-hydraulic actuators, one of which is indicated at 55, for applying service brakes. - The ground engaging structure provides for each
wheel braking device 56 for applying braking to thewheel braking device 56 being operated to apply the brake by hydraulic fluid pressurised by an air-hydraulic actuator 55. Each air-hydraulic actuator 55 may be operative to supply pressurised hydraulic fluid to one or a plurality of thebraking devices 56. - In this example, each
braking device 56 is a pad and disc type device including a rotatable member namely adisc 57, which rotates with the associatedwheel rotating disc 57 to effect braking, by hydraulic fluid acting for example through a "slave" piston and cylinder arrangement. - The air-
hydraulic actuator 55 pressurises hydraulic fluid from abrake fluid reservoir 62, by means of an air poweredservo 61 mechanism such that the hydraulic fluid pressure developed, and accordingly the extent of braking, depends upon the air pressure delivered from the pedal operatedair valve 49. Thus the further an operator depresses thebrake pedal 50, the greater the braking force applied by thebraking device 56 to its associatedwheel - The
service brakes 56 preferably are released by mechanical springs when air pressure is no longer supplied to the air-hydraulic actuators 55, i.e. when thebrake pedal 50 is released. Thefoot pedal 50 too may be returned to its uppermost, unbraking position, by a mechanical spring, although in each case some other brake return/pedal release mechanism may be provided as required. - In accordance with the present invention, the
braking system 5 for themachine 10 further includes a brake control system including acontroller 110 which provides a brake anti-locking function to resist any brakedwheel wheel - Thus the
braking system 5 includes, for eachbraking device 56, awheel speed sensor 112 to sense the rotational speed of each of thewheels controller 110 along a line, one of which for the one wheel shown in figure 2, is indicated at 114. - Typically the
wheel speed sensor 112 includes an annulus of teeth which rotate with thewheel rotatable brake disc 57, and an optical sensing device mounted with respect to a wheel hub, for sensing the teeth as they move past the device as the wheel, and hence as the annulus, rotates. The construction of such awheel speed sensor 112 is well known and further description is considered unnecessary. - The
controller 110 is configured to determine from the electrical signal inputs from thewheel speed sensors 112 of all or at least some of thewheels - This may be achieved by the
controller 110 using an algorithm which compareswheel - In the event that a skidding or potential skidding condition is determined, the
controller 110 is operative to modulate the hydraulic fluid pressure provided by the air-hydraulic actuator 55 which provides hydraulic fluid pressure to apply braking, to at least theskidding wheel wheels axle wheels wheel - Typically, the
controller 110 may modulate the hydraulic pressure provided to apply braking by cycling the hydraulic fluid pressure provided by the air -hydraulic actuator 55 or actuators, between a pressure reduction phase and a pressure increase phase although a cycle may also include a pressure hold phase between the pressure reduction and the pressure increase phases. In each case, by cycling releasing and applying the braking force applied to a wheel, steerability of themachine 10, even at high speeds may be maintained during braking without risk of loss of control. - Such modulation of the hydraulic fluid pressure is preferably achieved by modulating the brake demand pressurised air signal which is delivered from the
foot pedal 50valve 49. Thus thebraking system 5 may include a single one, or possibly a plurality of modulatingair pressure valves 115, which in accordance with an electrical control signal which passes along aline 116 from thecontroller 110 to the modulatingair pressure valve 115, modulates the demand signal from thefoot brake 50valve 49, which is applied to the air-hydraulic actuator oractuators 55. - Where only a single modulating
air pressure valve 115 is provided, this would vary the brake demand signal for all fourwheels air pressure valves 115 are provided, for example with each airpressure modulating valve 115 serving only one or two of the air-hydraulic actuators 55 for one or two of thebraking devices 56 for one or two of thewheels controller 110 to modulate the brake demand signal differently for e.g. for the front and therear wheels - In each case, the brake demand signal is only modulated to modulate the hydraulic fluid pressure applied to the
braking device 56 or devices, when a skidding condition or potential skidding condition, is determined. - The
machine 10 further includes a transmission brake for applying primarily when themachine 10 is parked, and particularly when no supply of pressurised air for theservice brakes 56, may be available. - In this example, the
machine 10 is four wheel driven and accordingly to achieve adequate transmission braking, two such transmission brakes, indicated at 65, 66 are provided. - Each
transmission brake disc 67 each of which is carried by a respective transmission member for therear wheel 16 drive, and for thefront wheel 15 drive. Also there is provided for frictionally engaging eachdisc 67, a pad, orpads 68 in this example. Thepads 68 are urged towards and into engagement with theirrespective discs 67, bymechanical springs 69, and hence in their rest conditions, the transmission brakes are applied to brake thediscs 67 and hence the transmission members. - However the
transmission brakes brake releasing devices 70, 71. By virtue of the transmissionbrake releasing devices 70, 71 being hydraulically releasable, notwithstanding that thesprings 69 applying the brakes will be very strong springs in order to generate sufficient braking force to apply thetransmission members 22, 23 adequately, thebrake releasing devices 70, 71 may be made much smaller than comparable air operated units. - The pressurised hydraulic fluid for releasing the
transmission brakes machine 10, via a fluid feed line indicated at 72, the hydraulic fluid passing though a transmissionbrake control valve 75. The transmissionbrake control valve 75 is biased by aspring 76 towards a first operative condition as indicated in figure 2, in which the hydraulically operatedbrake releasing devices 70, 71 are each connected through the transmissionbrake control valve 75 to thereservoir 37 or another low pressure area, and so thedevices 70, 71 will not act to release thetransmission brakes springs 69. In a second operative condition to which thevalve 75 is moveable against thespring 76, pressurised hydraulic fluid from thesupply line 72 may pass to the hydraulically operatedbrake releasing devices 70, 71 to release the brakes. 65,66. - The transmission
brake control valve 75 is moved to its second operative condition when thetransmission brakes valve 75 along an air supply line indicated at 78, in response to operation of an operator transmissionbrake control valve 80 from within thecab 9. Desirably the transmissionbrake control valve 80 is hand operated by an operator actuating abrake release lever 81. - In this example, pressurised air for releasing the
transmission brakes air system 46 provided for applying theservice brakes 56. Thus pressurised air may be delivered from theair system 46 along aline 82 to the transmissionbrake control valve 80. - It will be appreciated that in the event of a failure in the air system, or when the pressure in the
air system 46 deliberately is released, e.g. when it desired to park themachine 10 for long periods, no pressurised air will be available to move the transmissionbrake control valve 75 against itsspring 76 to its second operative condition and thus thetransmission brakes transmission brakes - Similarly in the event of any failure of the
hydraulic pump 36, there will be no pressurised hydraulic fluid available actually to release thetransmission brakes brake control valve 75 results in thetransmission brakes air system 50 or hydraulic pressure failures. - In another example the
transmission brakes brakes - Pressurised air for actuating the transmission
brake control valve 75 may be derived from other than the servicebrake air system 46, for example from a dedicated air source. - Pressurised hydraulic fluid for releasing the transmission
brake control valve 75 may be derived from other than the hydraulic system of themachine 10 which includesactuator 30 andcontrol valve 40 for operating theloading arm 25 of the machine, for example from a dedicated pressurised hydraulic fluid supply. - The transmission brake or
brakes brake control valve 75. - Various other modifications are possible without departing from the scope of the present invention.
Claims (14)
- A wheeled loading machine (10) including a body (11) mounting a loading arm (25), a ground engaging structure including a front axle (18) which carries a front pair of ground engaging wheels (15) and a rear axle (19) which carries a rear pair of ground engaging wheels (16), the loading arm (25) being mounted at a position (22) towards a rear of the machine (10) for up and down movement about a generally horizontal axis (A), and the loading arm (25) extending forwardly beside a cab (9) which is mounted at one side of the body (11), to an outermost end which is beyond a front of the body (11), and the loading arm (25) having at its outermost end a mounting (34) for a loading implement (32) and the arm (25) being extendible to vary the length of the loading arm (25), and each axle (18, 19) being suspended from the body (11) by a respective suspension, each of the ground engaging wheels (15, 16) being drivable by an engine (13) of the machine (10) through a mechanical transmission (T), and the machine (10) including a braking system (5) for braking each wheel (15, 16), the braking system (5) including a brake control system which provides a brake anti-locking function to resist any braked ground engaging wheel (15, 16) skidding relative to the ground as a result of becoming locked during braking when a low friction condition exists between the wheel (15, 16) and the ground.
- A machine according to claim 1 characterised in that the suspension suspending each of the front and rear axles is non-reactive in that the vertical load on the respective wheels (15, 16) carried by the axle (18, 19) and hence the traction between the wheels (15, 16) and the ground, does not significantly vary in response to changes in the driving torque applied to the wheels (15, 16) through the transmission (T).
- A machine according to claim 2 characterised in that the suspension includes for at least one of the front (18) and rear (19) axles at each side of the machine (10), a pair of links (100, 101), one link (100) of each pair being above (101) the other relative to the ground, the links of each pair (100, 101) being pivotally connected at their one ends (100a, 101 a) to relative to the body (11) and at their other ends (100b, 101 b) to the respective axle (18, 19).
- A machine according to claim 3 characterised in that the suspension includes for the at least one axle (18, 19), damping struts (105) to damp axle movements, provided between the axle (18, 19) and the body (11).
- A machine according to any one of the preceding claims characterised in that braking system (5) includes for each wheel, a braking device (56) operated by hydraulic fluid pressure, pressurised by an air-hydraulic actuator (55).
- A machine according to claim 5 characterised in that the brake control system includes for each wheel, a wheel speed sensor (112), the brake control system also including a controller (110) responsive to wheel speed signals from each of the wheel speed sensors (112), and operative to determine whether any braked wheel (15, 16) is skidding relative to the ground as a result of becoming locked during braking, and in the event that a skidding condition is determined, the controller (110) modulating the hydraulic fluid pressure provided to apply braking to at least the skidding wheel (15, 16).
- A machine according to claim 6 characterised in that the controller (110) modulates the hydraulic pressure provided to apply braking by cycling the pressure between a pressure reduction phase and a pressure increase phase.
- A machine according to claim 7 characterised in that the cycle includes a pressure hold phase between the pressure reduction and the pressure increase phases.
- A machine according to claim 7 or claim 8 characterised in that the controller (110) modulates the hydraulic fluid pressure provided to apply braking to both wheels (15, 16) of the front (18) and/or the rear (19) axle where any or both wheels (15, 16) are determined to be skidding relative to the ground during braking as a result of becoming locked.
- A machine according to claim 7, claim 8 or claim 9 characterised in that the hydraulic fluid pressure is modulated by modulating air pressure supplied to the air-hydraulic actuator (55).
- A machine according to any one of the preceding claims characterised in that the body (11) includes, at the rear end, a counterweight (33) at a low position which extends rearwardly of the body (11) beyond the horizontal axis (A) about which the loading arm (25) is moveable.
- A machine according to any one of the preceding claims characterised in that the horizontal axis (A) about which the loading arm (25) is moveable is located in a generally horizontal plane (P) which contains or is spaced above an upper level of the operator's cab (9).
- A machine according to claim 12 characterised in that the engine (13) is mounted by the body (11) above the rear axle (19) and below a rear portion of the loading arm (25).
- A machine according to any one of the preceding claims, which includes a loading implement (32) mounted at the outermost end of the loading arm (25), the loading implement (32) being a loading device provided on a carriage (28) which is mounted to the loading arm mounting (34), and the carriage (28) including at least one wheel (27), which when the loading arm (25) is in a lowered position, engages the ground.
Applications Claiming Priority (1)
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GB0612152A GB2439333A (en) | 2006-06-20 | 2006-06-20 | Loading machine with ABS |
Publications (3)
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EP1870375A2 true EP1870375A2 (en) | 2007-12-26 |
EP1870375A3 EP1870375A3 (en) | 2008-05-21 |
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US (1) | US7971889B2 (en) |
EP (1) | EP1870375B1 (en) |
AT (1) | ATE469098T1 (en) |
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Cited By (1)
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EP3202243A1 (en) * | 2016-02-02 | 2017-08-09 | AGCO International GmbH | Vehicle implement control |
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EP2000600A1 (en) * | 2006-03-29 | 2008-12-10 | Kubota Corporation | Wheel loader |
NL2003378C2 (en) * | 2009-08-21 | 2011-02-22 | Visser S Gravendeel Holding | DEVICE, COMPOSITION AND METHODS FOR RECORDING AND PUTTING OUT PACKABLE OBJECTS. |
JP6487872B2 (en) * | 2016-03-30 | 2019-03-20 | 日立建機株式会社 | Drive control device for work machine |
DE102017114917A1 (en) * | 2017-07-04 | 2019-01-10 | Claas Selbstfahrende Erntemaschinen Gmbh | Agricultural work vehicle |
US10858230B2 (en) * | 2018-11-05 | 2020-12-08 | Oshkosh Corporation | Leveling system for lift device |
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EP1093986A2 (en) | 1999-10-18 | 2001-04-25 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Driving control apparatus for industrial vehicle |
EP1123894A2 (en) | 2000-02-01 | 2001-08-16 | J.C. Bamford Excavators Limited | Load handling apparatus |
EP1258406A2 (en) | 2001-05-18 | 2002-11-20 | J.C. Bamford Excavators Limited | Vehicle equipped with towing means and anti-skid control system |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3202243A1 (en) * | 2016-02-02 | 2017-08-09 | AGCO International GmbH | Vehicle implement control |
Also Published As
Publication number | Publication date |
---|---|
EP1870375B1 (en) | 2010-05-26 |
AU2007202810A1 (en) | 2008-01-10 |
EP1870375A3 (en) | 2008-05-21 |
GB0619129D0 (en) | 2006-11-08 |
ATE469098T1 (en) | 2010-06-15 |
US20070289171A1 (en) | 2007-12-20 |
US7971889B2 (en) | 2011-07-05 |
GB2439302B (en) | 2011-07-13 |
ES2346085T3 (en) | 2010-10-08 |
AU2007202810B2 (en) | 2012-06-07 |
GB2439333A (en) | 2007-12-27 |
GB0612152D0 (en) | 2006-08-02 |
GB2439302A (en) | 2007-12-27 |
DE602007006720D1 (en) | 2010-07-08 |
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